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  1. D

    Engine running rough @ 3,500 rpm

    Anyone with ideas? im getting to the end of my rope with it.
  2. D

    Engine running rough @ 3,500 rpm

    yeah, I replaced the O2 sensor along with fuel injectors, I forgot to mention that.
  3. D

    Engine running rough @ 3,500 rpm

    I recently swapped the engine to another 4.0 after a blown rod. It runs fine under 3,500 rpm, then when it reaches that range it will have sporadic backfires and run very roughly and will no longer climb Rpms. Also when it shifts into third gear going around 45 mph if you give it a small amount...
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